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oidium

[oh-id-ee-uh m]
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noun, plural o·id·i·a [oh-id-ee-uh] /oʊˈɪd i ə/. Mycology.
  1. one of the conidia that are borne in chains by certain fungi.
  2. (in certain fungi) a thin-walled spore derived from the fragmentation of a hypha into its component cells.
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Origin of oidium

1855–60; < New Latin < Greek ōi(ón) egg1 (cognate with Latin ovum; see oo-) + -idium -idium
Related formso·id·i·oid, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for oidia

oidium

noun plural -ia (-ɪə)
  1. botany any of various fungal spores produced in the form of a chain by the development of septa in a hypha
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Word Origin

New Latin: from oo- + -idium diminutive suffix
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012